German authorities complained that the show glamorized the hard work that German building sites entailed. To redress the balance, Channel 4 produced The Real Auf Wiedersehen Pet, a documentary that put forward the true facts.
The novelization of the second series ("Auf Wiedersehen, Pet 2" by Fred Taylor) ended abruptly with Oz winning the Spanish lottery. It went into no details about Barry's wedding and the impending customs chase. This was because the novel was based on an earlier version of the script. This is also apparent as the book covers some of the scenes that Gary Holton would have filmed had he been alive.
The Kosovan Albanian character Irena is played by a Serbian actress, Zelda Tinska. This is ironic given the conflict between the Albanian and Serbian characters in the series.
Most of the German location shots in Series 1 were filmed in Hamburg, not Dusseldorf. One of the giveaways is that many of the cars have HH (Hamburg) number plates.